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Shell Mail is not working

Hi - I am trying to send an email to mobile,so that it can be received as SMS and i used the below code snippet and it is not working
am i missing something

	echo "texting to number" | mailx -s "Text message via email" "1234567890@txt.att.net"

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also tried
	echo "texting to number" | mailx -s "Text message via email" 1234567890@txt.att.net

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but when i give email it is working

	echo "texting to number" | mailx -s "Text message via email"  abcd@outlook.com

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so why it did not work for 1234567890@txt.att.net.
I am sure the sms provider name is correct for att, because when i send email using outlook to 1234567890@txt.att.net i got text message.
1 Solution
First thing first,

Can you send email normally (ie: through an email client) on that box?

If so:
Is that box configured as a mail server? (Sendmail/postfix configured and operational, etc)
or do you use a third-party email server (gmail, ISP, etc) to send mail
Do you get any error or email fail to deliver message?

You can always test sending email directly using telnet command. Please see steps for using telnet to send email in below link:

Hi shragi,

mailx has a '-v' (verbose) switch that may help you work out what is going wrong.  If it reveals nothing obvious, maybe you could compare the output you get when you use '-v' to send to 1234567890@txt.att.net and abcd@outlook.com and see if anything looks wrong.

Please provide feedback
mailx will invoke /usr/lib/sendmail to send the mail. the sender will be picked from environment or will default to username@boxname.

i'd assume your other tests were directed to a local account and you probably do not relay mail to outside accounts.

anyway, whatever is wrong should be visible in /var/log/maillog or mail.log

you can also specify a host such as mx3a.txt.att.net ( which handles incoming mail for txt.att.net ) and directly send the email ( if you have internet port 25 access ), in verbose mode so you can determine if things go wrong. but i don't know if mailx is capable of resending the email in case of failure
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